1. Department of Microbiology and Virology, Faculty of Natural Sciences, Comenius University in Bratislava, 842 15 Bratislava, Slovakia
2. Institute of Animal Biochemistry and Genetics, Centre of Biosciences, Slovak Academy of Sciences, Dúbravska Cesta 9, 840 05 Bratislava, Slovakia
3. Research and Development Unit, Department of Environmental Health, National Institute of Health Dr. Ricardo Jorge, 1649-016 Lisboa, Portugal